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Exploring Technical Challenges and Opportunities in Dark Fibre Utilization for NRENs

This document discusses the growing prevalence of dark fibre and the ongoing efforts to locate and leverage its potential in various regions. It examines the technical issues surrounding transmission equipment, cost reduction strategies, and protocol selection. The need for compatibility among multi-vendor networks, along with the management of bandwidth allocation and network complexity, is highlighted. Furthermore, it emphasizes the importance of collaboration with industry vendors and standard bodies to address interoperability and management challenges.

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Exploring Technical Challenges and Opportunities in Dark Fibre Utilization for NRENs

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  1. Technical Issues • Dark fibre is becoming more ubiquitous • Still need to find out if/where it exists in some places. • Investigate use of dark fibre in possession of NREN by other NRENs. • Investigate transmission equipment (L1) • How to drive down costs (integrating ports, regeneration or amplification etc..)? • Which transmission protocol to use (SDH, GE or 10GBase)? • Moving to fewer devices in core? • Have one-to-one discussions with industry vendors. • Agreed that multi-domain, multi-vendor hybrid networks are the future. • How to achieve inter(-optical) domain model? • Problems with ‘not-quite-compatible’ standards. Work with vendors and standard bodies on interoperability issues (e.g. in control plane) • Management and policy issues to resolve. EARNEST Workshop, 24 May 2006

  2. Technical Issues • Bandwidth allocation • Stick with IP that is best effort and solve problem with overprovisioning and/or separate networks for demanding users? • Develop bandwidth reservation techniques (at control plane and/or middleware levels)? • Will the sharing of network capacity only become feasible when bandwidth becomes so cheap and abundant that no-one cares about it? • Testbed networks • The ability to undertake disruptive testing is required. • Potentially need to test new lower-layer protocols. • Need to be neutral, long-distance and multi-vendor. EARNEST Workshop, 24 May 2006

  3. Technical Issues • Network management • Use of IPv4, IPv6 or something new (GENI?) • Should everyone have a public IP address? • Firewalls and NATs complicate management and force protocols to be used for unsuitable tasks. • How to manage multiple VLANs? • Concerns about increasing network management complexity with separate optical, IP (and other?) layers to manage. • Wider issues • Investigate scaling of large AAI federations. • Focus so much on Grid requirements? • Work more closely with vendors as to community requirements. • General trend to support more, but smaller users (e.g. schools). EARNEST Workshop, 24 May 2006

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